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regression exam

QuestionAnswer
regression purpose estimate the value of the dependent variable based on the independent variable
a, intercept the predicted value of y when x=0
b, slope shows how much the DV will change when the IV (x) increases by one unit
bivariate relationship 2 variables, scatterplots, correlation, and regression are ways to examine bivariate relationships
hypothesis a statement that can be tested empirically, research question turned into statement
research question a question that can be answered empirically
independent variable explanatory variable, influences the DV
dependent variable response/outcome variable, influenced by the IV
scatterplot do not connect dots, IV on x axis, DV on y axis
shapes of scatterplot linear, nonlinear/curvilinear, no pattern
direction of scatterplot positive, negative
positive association variables vary in the same direction
negative association variables vary in opposite directions
strength of scatterplot the most tightly clustered, the stronger the relationship
correlation (r) a measure of the direction and strength of a linear relationship
regression line minimizes the error (residual) between the predicted value of Y (Y^) and the observed value of Y (Yi)
error distance between the actual value of Y (Yi) and the predicted value of Y (Y^)
regression and outliers outliers can pull the regression line in one direction
r squared tells us what proportion of the variation in Y is explained by X as accounted for in the regression equation
ordinary least squares regression the best fitting line is the one that produces the smallest total squared error
r squared interpretation percentage of the variation in ____ can be explained by the ______
Created by: 23cryera
 

 



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